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使用多个翻译和持续时间偏移重复 Android 动画

我想要一个可以无限上下移动图像的动画。但是,当我运行代码时,动画仅发生一次。这是动画 xml: 我想要一个可以无限上下移动图像的动画。但是,当我运行代码时,动画仅发生一次。这是动画 xml: <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/linear_interpolator" android:repeatCount="3" android:repeatMode="restart"> <!-- move down --> <translate android:fromYDelta="0%" android:toYDelta="50%" android:duration="1500" android:fillAfter="true"/> <!-- move up --> <translate android:fromYDelta="0%" android:startOffset="1500" android:toYDelta="-50%" android:duration="1500" android:fillAfter="true"/> <!-- continue to move up --> <translate android:fromYDelta="0%" android:startOffset="3000" android:toYDelta="-20%" android:duration="600" android:fillAfter="true"/> <!-- down to original pos --> <translate android:fromYDelta="0%" android:startOffset="3600" android:toYDelta="20%" android:duration="600" android:fillAfter="true"/> </set> 这是我的java代码: public class MainActivity extends AppCompatActivity { Animation move1, move2, move3, move4, move5; Button login; ImageView bar1, bar2, bar3, bar4, bar5; int delay1 = 500; int delay2 = 1560; int delay3 = 2300; int delay4 = 3065; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); EdgeToEdge.enable(this); setContentView(R.layout.activity_main); login = findViewById(R.id.btLogin); bar1 = findViewById(R.id.ivBar1); bar2 = findViewById(R.id.ivBar2); bar3 = findViewById(R.id.ivBar3); bar4 = findViewById(R.id.ivBar4); bar5 = findViewById(R.id.ivBar5); move1= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.move); move2= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.move); move3= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.move); move4= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.move); move5= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.move); bar1.startAnimation(move1); Handler handler = new Handler(); handler.postDelayed(() -> bar2.startAnimation(move2), delay1); handler.postDelayed(() -> bar3.startAnimation(move3), delay2); handler.postDelayed(() -> bar4.startAnimation(move4), delay3); handler.postDelayed(() -> bar5.startAnimation(move5), delay4); ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> { Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars()); v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom); return insets; }); } } 为什么它不无限重复?和xml中的fill-after属性有关系吗?非常感谢您的帮助,这是一个班级项目。 从动画 XML 中删除 android:fillAfter="true",并在父 android:repeatCount="infinite" 标记中设置 <set>,而不是 repeatCount="3"。 fillAfter 使每个动画保持其最终状态,防止正确循环。 <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/linear_interpolator" android:repeatCount="infinite" android:repeatMode="restart"> <!-- move down --> <translate android:fromYDelta="0%" android:toYDelta="50%" android:duration="1500"/> <!-- move up --> <translate android:fromYDelta="50%" android:startOffset="1500" android:toYDelta="-50%" android:duration="1500"/> <!-- continue to move up --> <translate android:fromYDelta="-50%" android:startOffset="3000" android:toYDelta="-20%" android:duration="600"/> <!-- down to original pos --> <translate android:fromYDelta="-20%" android:startOffset="3600" android:toYDelta="0%" android:duration="600"/> </set> 这就是让它无限循环所需的全部。


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